A word used by best friends whose love for each other is untouchable & unconditional. The word is used when addressing the best or speaking of the friend to others. Other words also commonly used are "Bifster" "Biffinator" and the ever so infamous "Biffy Bifferson"

Example #1
Best Friend #1: Biffy! I'm so happy your here!
Best Friend #2: Of course I came Bifster, I'm your best friend, I wouldn't miss this for the world.

Example #2:

Best Friend #1: Does this outfit make me look fat?
Best Friend #2: Girlfriend! You look great! I don't have ugly friends, you should know that by now Biffy Bifferson!